Last week, Kellogg's had to defend its claims that vitamin-enriched cereal can support a child's immunity. Kellogg's pins those claims on science. Some doctors aren't convinced. However, no one is debating the immune-boosting value of hitting the snooze button a few extra times in the morning.

For a nursing baby, a mother's milk is hard to beat as a way to kick-start the immune system. For a senior, time is the immune system's worst enemy. But for all those in between, a little extra sleep is your best weapon and a small price to pay to keep the flu at bay.